Obviously they are going with iconic albums that sold well and produced a few hit singles that were accompanied by successful world tours. So if Queen go this route, following the same idea of including an alternate version of the album (a raw sessions 2?) Which album would be most logical?

I would have to assume "The Game." Several successful singles, two of which were Queen's only number 1s in America. It was rumored to have many more tracks worked on during the sessions not to mention some interesting possibilities for a raw sessions CD (Freddie singing all of Rock It Prime Jive for example.

I must say though the one album I would be most interested would be "Made in Heaven" not just for the emotional aspect but just in seeing/hearing how those tracks were put together or which songs were considered and maybe worked on a bit before being rejected.

Honestly, as harsh as it sounds, considering Brian and Roger's (though, probably, just Brian's) almost pathological fear of having us hear something that they do not consider perfect, and the way they have vetoed interesting material and insisted on making Frankensteinian hybrid mixes to polish up original work-in-progress tracks - I would rather wait for a long time and see box sets put out after Brian and Roger are no longer with us, so that we get to hear the ACTUAL material and not the products of obsessive-compulsive revisionism.

I've really gone off Brian and Roger, as you can probably read from the above.

The Game and Jazz but of course I'd love to hear all three albums as a box of 6 CD's as @dudeofqueen suggested.

It would be nice (if they'd choose The Game as the next collector's box-set) to finally know if it was originally recorded as a double-album and to hear those tracks rejected (the second "album"). As some may remember, some time ago a queenzone poster named Roger's Untidy Bottom came here claiming all that about The Game. He claimed to be one of the band's friends from the inner-circle and being present at the recording session he claimed that The Game was recorded as a double-album but the second side was shelved shortly before pressing the album. He also claimed that Freddie recorded all of the lyrics written for Let Me Live.